Battery monitor



FIG. 1 is a front view of a battery monitor showing the instant design;

FIG. 2 is a left side view of the battery monitor;

FIG. 3 is a rear view of the battery monitor;

FIG. 4 is a right side view of the battery monitor;

FIG. 5 is a bottom view of the battery monitor; and,

FIG. 6 is a top view of the battery monitor. 

The ornamental design for a battery monitor, as shown and described. 